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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c06b319f653e30f18c70220bfa6ead7724ad74270ef8d094dab46f1b5299106' 
  AND token = '3e3Oj8L6hCHCxTPNLnSJIWTR70jLQ7DpXMgP4u6TIys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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