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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd9af2c6a9512989e269ae2c02c9faf2d01f478d3d940069bdc320468a0ed13' 
  AND token = 'NC89BOS8HaKc6DyrKnjGkxIO6v7+eTC45ui9FKYtmXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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