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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a6855d545f4e1fd16325d8dc9af7ab294f84d1cd9a198bd5dbf076bbe9af1c' 
  AND token = 'EAvmfbu0FlnKXqF9gc6SkUVPj1uNMKoGsoKi4gwOenE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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