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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe830d0bafa5b0353cfd1c5de4d0f5d61bfd8d7d30e31aa46727889eb20e6e2d' 
  AND token = '551mYt/oaslVXoYkKDm7DEvVCwFZL9mojSqvONqgODc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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