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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d9c5ddde6cc3e255b37dc916f8ae5df178c0a0c5882af957eb3f71d20d1b4b' 
  AND token = '2JBlQA/o8vn+5ov2sxYhWUSKo3akrcm4Z4x5qNazRQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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