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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a9b1c5c55552f02c80c534a6cd0cc07a25d503bf7f14be1372f760d7778e2b' 
  AND token = 'MfnFUi2acWs3z4DWlN26i1smVuZn50ytVGK5xLrGW4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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