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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7665eef38504e9f50c1048c0eded875d567b2f56ce1cc6f810fb0e1a84a66df' 
  AND token = 'kValFy2BgxQBRCL71LpxV0R7c6JGNqkoElOtVT09TOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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