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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ffdc63989d62b74a43e58c2b519527d2da1f657a8b32f32e06fb93e8f3c2b2' 
  AND token = 'EECKcXGrRHvmC0oyYkcOeJy3rVje4UsE8f4fPbxqe9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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