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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd21e98b0571bc246c950323e529a9402884c8668918bf6048fef19caa436ae85' 
  AND token = '6bU8DdAZWOvWkvKr44GOIRNwp4dzXv6Z6IR0vnez8Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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