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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d1b47ca7890771a36ca7bf15756f9bb75c7a45bc49238770dab0d332ece0e0' 
  AND token = 'GS/wyWjUE8DppfPGrc9u/tq/+P1db42F3w4DExkLS2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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