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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87cc630be97c11ec749108e2077b317557383f4abb24eeb93f2037cdca35795' 
  AND token = 'MP1T/oqevA5RNfhusxPAv/aH2CunkBOxpY99h5j/6UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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