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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece1935662bfbe2f98d17839c1d185f219534ff8cad5dda37cea79f9b0c117c9' 
  AND token = 'y4d0F+6st+lKPYA03h10uTIZTI8G01QExCmj88q9gog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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