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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e63170a32a28ea4d8091d3bf0017e2a3a1631d647c1939babb295a60380f3f' 
  AND token = 'a0x2pfxtL/C9NeH+NU3GmmCABoSWnv5gc1x4zsDEHew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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