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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d012d7f2ec2211b8d368143b8fb93fab77a92c256d9d23b2a2e2c84470c5aa' 
  AND token = 'g2sK+JAJKmkMLJnokSUKbeRD1FcwGCJabA7o69wYlKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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