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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9cb24c5adb4b2d350fe0ffdbd2d18ac0a2b0bbc53a0001a884fde9419a79a0' 
  AND token = '/0iFxL1ZvB+0NxZtK3R1zxC4p3g6UK0iCi3Ym5o+gEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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