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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c1ab1c4b505317c9a2f107dbfff2dd7600f32b9b16b278b43f8ccaa8a992e7' 
  AND token = 'n2b/KO+OQsneEa01iuZzqPAWS44jDvPecm0Arz37KlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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