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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a14097d8653d30632f8f0cf9a00c23ac2d757f8d34fb592ac51d5232918c831' 
  AND token = 'HPV1F3o5BDdyD6IYvl3V3QO7iaE5Tu3aQ52XQqfFSVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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