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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ba1988917d970b4220eff1ec980a635c569afa314cc4e888f6312e764cdf7b' 
  AND token = 'XztQowvaRASgQ07gQ3B7iqyEHEYsn0chO7FUR1xVNes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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