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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d0c47781ab00bb48e35a956af74095a92def4c2f653232af1dd17fe77c50ba' 
  AND token = 'lMdIxD9Gt9Dldy+r0BPP9ff5Y3wYgBvX/xr3y9VcP7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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