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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fafe294bde1ad1c5f7c59dc7a8b1db97dcf6820d3173593623401e3953394b94' 
  AND token = 'R+6dA7SpcNZF+Q3CwREwroXZDequBvl+f8GO6VmfOO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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