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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b78e068d962ac1b93d15b8c297f414028f33a27fe7ce7621043a7f865f230b98' 
  AND token = 'Y61uyQ37jmplD7faoOp2udOW86hXXcvDVcAVsJqs6Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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