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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7fd772be5c462a114dbe27d976555f52368928bbdeaddcaa199cf00224090a' 
  AND token = '3mHSqSazOVY58kDTOkD+f10k77mH+1vn1u2xIL/BMFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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