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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b520217f15a4c8f3992997ba8bdf7dc42a4149b958f7f965ff65ff64af480182' 
  AND token = 'upP4cOlBsL5Ny/mhbu3U9OTHdomS8+qpansFL5TAXhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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