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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29282e503a22c53a9b112a10e0bbbebc66798c5db110349663b8fd6193af545' 
  AND token = 'Cb1X4RI/LxWIxHwJ988Da9gduPT1bnxLUN/6iWvM/aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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