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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3a349e2e3615fbe5f37976cb0e478093fb298ca86b9fb59f3670f3c27c431f' 
  AND token = '92baMmn67XgkPLATKPw6hmwxYYwohZZPoCMtPj6fN7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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