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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513ffeb824118c5e017dc110f086f82b7e668eac66673670238757fefb883741' 
  AND token = 'sU7LqoulYLz2vIRNDaln0RM3kVcApJaSZbR1UzYe0eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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