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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a0ce5a80feefcb138d7b855bd34af366d2646743c9eb19f60142d31b63ee2a' 
  AND token = '/R+iw8No2IEOgIxzNCubxmY2IqxO4eOAMcuOEMNFOjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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