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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff971d41a4606a92c0cbb524d077b987f32788c8d92b0245377d8eea8bc9075d' 
  AND token = 'HWJ1meEqI/rTv5gX4hdZO3k00PSFIGw6beMIK5EnTII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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