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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8fd9a2001cc54a74e7d9f123cb856705a82989f7466cde6c525fb09bd5f34f5' 
  AND token = 'CT+sSOS36kJ7s7T210z5plMO7U3jnfRB4oqG43bV5ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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