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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a5c495145b0508b7221830de94b66092d990fc1eeea318f1c411717fd62fe3e' 
  AND token = '5Bye8kHxqNkcAoRtwW2dDWL2mQwpLU63ei+0mt7y+Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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