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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1236642ee3043a2e0d9830a78f6126ad845009f4f1321990a9049e4c5ef4c46e' 
  AND token = 'dVMKrrNVatul79m1yW38szYbU3gkgHJ/nf+jJMzSyNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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