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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c696ebdc8e34f8b1b7601fec0d66e50f4bcc351eea62e8d477faa15d371259c' 
  AND token = 'e7hmrgFJkw02tfwjsN5r/BJSfuOrjytNgjSO8JZ9s8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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