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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2ba4eedc75d3986a2dd0842168d0ee8f915a18f0da008d2b02b170ca3ed06d' 
  AND token = 'PSPlBh9BVdM79ZFVn6Cg+mkebCZ8so2H0VFK0hpK4hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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