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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3e839273839375c20aa445528842427d3fa418bc2a788b433e079d084326ff' 
  AND token = 'oA/NGTAD71AD7TP8sAt1TZFuPBopBS2nbOk7iIoNV34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}