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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15bc7c2b3dbe4e166b0e868f47cac1389f343d8bae6796f694e3139a1037649' 
  AND token = 'BPtMPOmvCh1saehAQdtij2z4sKqpTp9FHNPckVgkEa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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