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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb57a68cf6e9fc96e1a443b8cd0e79c49be2d5e0959285453a97235e974a7ecf' 
  AND token = '0s7IoX25LgKf7/G9CnC1VsITXTo7LVQSfEZWYuOH8/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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