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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b22395f3b15ff29ad48fd1a11b9de85fabaa29659f6d88cf2db2d33c0da8cc47' 
  AND token = '7s5TAsj0k5reoVNt+2e4s54ZnMO5ANvU6PG3f5Zug+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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