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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987dd701e30941712b76622d58d93909de49bd0598a4c5b12cc03c94c1154b94' 
  AND token = 'cE5Q38aOh9VxUfUTcZpdspstQhADRNsB96VZlcn2FLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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