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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e4d800dee054f46e379279e84bf349c80326083d621a31a608fc7f3b9c5ba1' 
  AND token = 'Om3mbliw+VH4uUTjInWLH/m8z+fiKLAQRJO9ekXkBA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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