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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a39b9bc268d2d96075e60e7675d27623d17a7941ff969c8778ca2b10e7e46c9' 
  AND token = 'nx4ec2mfbko0foS6q6A6T2Drr3M7IhP+w+RALvEx+VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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