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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdb26c3392bc717f4eb651ad5785daf1cf3cb2dfb528ad0f7cbc459da6090bf' 
  AND token = 'knr/FBa/3LnftdEiypg9IyYXR3oG+WCzTgX0eqBrRBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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