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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba1b7844009e828a0c67a664c091114959c45f8ad223b141202d205beb31ea2' 
  AND token = 'kGos3Ci5epoIsZfONHauk39r4NZwvoPVWFpDtPJISAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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