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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62454e4ef031fc056dbabd243fcb55875e49433f5290c1ece2d028b35d82b11' 
  AND token = 'F0uzNih/1R2bqY8VtG0Rd2sapWt6f7lshK48qn9lrzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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