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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a42bb394c0f3461310f00ccece37e8b020c4360d64aebcdbd99d3321c847913a' 
  AND token = 'YqFvAJ0qfGj4DQ9s0fhVaGBHNdG8Szjz3bRwsdbKejs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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