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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29341352847e0b102537acdcce90a1a871d3ac4291b157556739c2e056b2f0c' 
  AND token = 'Xvj0+9nFxQ/03ZFa5V90M2G4eN4AuQo1rFQEU/OeB5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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