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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c113559be8b4c59badcf28521153abfd67a473d68a1cc903ae293b0b74c86b00' 
  AND token = 'LdRkMxgcyIiLfTVFHNR2iy/gSTwo5izywBH+7gw+d6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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