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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285751430a1ed0b959d7582e4965c54e86ef3c42e0ce6ca699c7ec3b59064c7d' 
  AND token = 'Z0LjczuaJ4e6x+g68DowyP5khRGmOgdQ1Rn0LjzKxcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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