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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0910d0904e8ec007f4a04e58a004bb5add6cfd263120a9521ef48044ac6604e' 
  AND token = 'b0RDKep2dJPqbrKgI9T9aAuodngqfm7atz9/a/w0MSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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