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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab0a327f175ce59c01367baa99d54b44ca4020a9cd819d3f264e6432c166ade' 
  AND token = 's24ZdmLiZcPMiZci2utmZ+2xYwOGvvyIvFVpwc5O72Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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