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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555ce3a57d6a4ec19fe77ea035842a7f32bfa11f02497b320ce96a89527e83ef' 
  AND token = '4DqlfKsX11VHkfy0WeKfOILs2Vv9vJVbypSMBFp/8sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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