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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06a1ebb83cd6c556116573bbd9ebd23e7e1af2f16d65f6071f9e6296c75d95d' 
  AND token = 'W1AgVLQn8SVbTNrmXRmQrC5x+AJ2UeIxrM5jf3Kecos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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