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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7fe10b24068aea41f4238ff6cd259911c00535569b5aa14552357afcef6844' 
  AND token = 'kA6+i3rP6ofbIlao9P8xu17nG2YOoxWLnVOg0yJl/xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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