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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd310e2fda95dc1a26c64f0a6bc486b010f7f2c5444c05065513da24f19a17126' 
  AND token = '6mNmuAF7LxpcyVYeAOjukXUVKjoJHfaXha+k1i3FGGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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