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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d808a72e14f8dc0fa591193a4f64b6476479608b529265d8cadd03a5b95365' 
  AND token = 'Ati23z8S4HGRQ2WSqZ8PsnxyFMCTf1VoFWZ7kZ8e+fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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