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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a297fea0352262e27b2c99bb39b3893bdee575dfd910a38873601a23649a55' 
  AND token = 'ESlQpmR6S53zePMO9199aXZVFW+0aL3KG7N7X5CT5Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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