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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2b6bd350d6ab17ea156c9e052c9247ead1e56056da513048e245b69b0e9c4b' 
  AND token = 'E4uXoE3jo2Yt3TrMMnKJJIrLsHS7kGdJqYPRkJnzOQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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